3.3 Compound and mixture

What is a compound?

• A substance made up of two or more elements physically combined together

• A substance made up of two or more compounds

• A substance made up of only one element

• A substance made up of two or more elements chemically combined together

How are different elements in a compound joined together?

• In increasing proportion by mass

• In decreasing proportion by mass

• In fixed proportion by mass

• In random proportion by mass

What is the chemical formula of common salt?

• NaCl

• CaCO3

• MgO

• H2O

What is the chemical formula of water?

• MgO

• CaCO3

• H2O

• NaCl

What is the chemical formula of chalk?

• MgO

• CaCO3

• H2O

• NaCl

What is a mixture?

• A substance made up of two or more elements physically combined together

• A substance made up of two or more elements chemically combined together

• A substance made up of only one element

• A substance made up of two or more compounds

What type of mixture is bronze?

• None of the above

• Element - Element

• Element - Compound

• Compound - Compound

What type of mixture is air?

• None of the above

• Compound - Compound

• Element - Compound

• Element - Element

What type of mixture is sea water?

• None of the above

• Element - Element

• Element - Compound

• Compound - Compound

How can a mixture be separated into its components?

• By freezing at low temperature

• By chemical methods

• By physical methods

• By heating at high temperature